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    <title>Hello, world!</title>
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  <body>
    <h1>Hello, world!</h1>
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    <ul class="nav nav-pills">
        <li class="nav-item">
          <a class="nav-link active" href="#">Active</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled">Disabled</a>
        </li>
      </ul>
    
    <!-- 栅格系统 -->
    <div class="container">
        <div class="row">
          <div class="col-sm">
            一心一意
          </div>
          <div class="col-sm">
            二龙戏珠
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          <div class="col-sm">
            三阳开泰
          </div>
        </div>
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      <!-- 图片 -->

      <!-- <img src="https://www-static.chinacdn.starbucks.com.cn/prod/images/pages/starbucks-design-studio-web-china.jpg" class="img-fluid" alt="..."> -->
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    <figure class="figure">
        <img src="https://gd2.alicdn.com/imgextra/i3/2214238661365/O1CN01Xz5GVU1LxDOtmCzMd_!!2214238661365.jpg_400x400.jpg" class="figure-img img-fluid rounded" alt="...">
        <figcaption class="figure-caption">A caption for the above image.</figcaption>
    </figure> -->

    <table class="table">
        <thead>
          <tr>
            <th scope="col">#</th>
            <th scope="col">First</th>
            <th scope="col">Last</th>
            <th scope="col">Handle</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <th scope="row">1</th>
            <td>Mark</td>
            <td>Otto</td>
            <td>@mdo</td>
          </tr>
          <tr>
            <th scope="row">2</th>
            <td>Jacob</td>
            <td>Thornton</td>
            <td>@fat</td>
          </tr>
          <tr>
            <th scope="row">3</th>
            <td>Larry</td>
            <td>the Bird</td>
            <td>@twitter</td>
          </tr>
        </tbody>
      </table>

<div class="alert alert-success" role="alert">
    A simple success alert—check it out!
  </div>


  <div class="alert alert-danger" role="alert">
    A simple danger alert—check it out!
  </div>


  <h1>Example heading <span class="badge badge-secondary">New</span></h1>
  <button type="button" class="btn btn-success">Success</button>
  <button type="button" class="btn btn-danger">Danger</button>
  <button type="button" class="btn btn-warning">Warning</button>
  
  
  <div class="card" style="width: 18rem;">
    <img src="https://gd2.alicdn.com/imgextra/i3/2214238661365/O1CN01Xz5GVU1LxDOtmCzMd_!!2214238661365.jpg_400x400.jpg" class="card-img-top" alt="...">
    <div class="card-body">
      <h5 class="card-title">Card title</h5>
      <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
      <a href="#" class="btn btn-primary">Go somewhere</a>
    </div>
  </div>

</body>
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